/**************************************************************************
  Copyright (c) 2013, The OpenBLAS Project
  All rights reserved.
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  modification, are permitted provided that the following conditions are
  met:
  1. Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in
  the documentation and/or other materials provided with the
  distribution.
  3. Neither the name of the OpenBLAS project nor the names of
  its contributors may be used to endorse or promote products
  derived from this software without specific prior written permission.
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
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  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/

#include <string.h>

#define CPU_UNKNOWN       0
#define CPU_ARMV8         1
// Arm
#define CPU_CORTEXA53     2
#define CPU_CORTEXA57     3
#define CPU_CORTEXA72     4
#define CPU_CORTEXA73     5
#define CPU_NEOVERSEN1    11
// Qualcomm
#define CPU_FALKOR        6
// Cavium
#define CPU_THUNDERX      7
#define CPU_THUNDERX2T99  8
#define CPU_THUNDERX3T110 12
//Hisilicon
#define CPU_TSV110        9
// Ampere
#define CPU_EMAG8180      10

static char *cpuname[] = {
    "UNKNOWN",
    "ARMV8" ,
    "CORTEXA53",
    "CORTEXA57",
    "CORTEXA72",
    "CORTEXA73",
    "FALKOR",
    "THUNDERX",
    "THUNDERX2T99",
    "TSV110",
    "EMAG8180",
    "NEOVERSEN1",
    "THUNDERX3T110"
};

static char *cpuname_lower[] = {
    "unknown",
    "armv8",
    "cortexa53",
    "cortexa57",
    "cortexa72",
    "cortexa73",
    "falkor",
    "thunderx",
    "thunderx2t99",
    "tsv110",
    "emag8180",
    "neoversen1",
    "thunderx3t110"
};

int get_feature(char *search)
{
#if defined(linux) || defined(__linux__)
    FILE * infile;
    char buffer[2048], *p,*t;
    p = (char *)NULL ;

    infile = fopen("/proc/cpuinfo", "r");

    while (fgets(buffer, sizeof(buffer), infile)) {
        if (!strncmp("Features", buffer, 8)) {
            p = strchr(buffer, ':') + 2;
            break;
        }
    }

    fclose(infile);

    if (p == NULL) return 0;

    t = strtok(p," ");
    while ((t = strtok(NULL, " "))) {
        if (!strcmp(t, search)) {
            return(1);
        }
    }

#endif
    return(0);
}

int detect(void)
{
#if defined(linux) || defined(__linux__)
    FILE * infile;
    char buffer[512], *p, *cpu_part = NULL, *cpu_implementer = NULL;
    p = (char *)NULL ;

    infile = fopen("/proc/cpuinfo", "r");
    while (fgets(buffer, sizeof(buffer), infile)) {
        if ((cpu_part != NULL) && (cpu_implementer != NULL)) {
            break;
        }

        if ((cpu_part == NULL) && !strncmp("CPU part", buffer, 8)) {
            cpu_part = strchr(buffer, ':') + 2;
            cpu_part = strdup(cpu_part);
        } else if ((cpu_implementer == NULL) && !strncmp("CPU implementer", buffer, 15)) {
            cpu_implementer = strchr(buffer, ':') + 2;
            cpu_implementer = strdup(cpu_implementer);
        }
    }

    fclose(infile);
    if(cpu_part != NULL && cpu_implementer != NULL) {
        // Arm
        if (strstr(cpu_implementer, "0x41")) {
            if (strstr(cpu_part, "0xd03"))
                return CPU_CORTEXA53;
            else if (strstr(cpu_part, "0xd07"))
                return CPU_CORTEXA57;
            else if (strstr(cpu_part, "0xd08"))
                return CPU_CORTEXA72;
            else if (strstr(cpu_part, "0xd09"))
                return CPU_CORTEXA73;
            else if (strstr(cpu_part, "0xd0c"))
                return CPU_NEOVERSEN1;
        }
        // Qualcomm
        else if (strstr(cpu_implementer, "0x51") && strstr(cpu_part, "0xc00"))
            return CPU_FALKOR;
        // Cavium
        else if (strstr(cpu_implementer, "0x43") && strstr(cpu_part, "0x0a1"))
            return CPU_THUNDERX;
        else if (strstr(cpu_implementer, "0x43") && strstr(cpu_part, "0x0af"))
            return CPU_THUNDERX2T99;
        else if (strstr(cpu_implementer, "0x43") && strstr(cpu_part, "0x0b8"))
            return CPU_THUNDERX3T110;
        // HiSilicon
        else if (strstr(cpu_implementer, "0x48") && strstr(cpu_part, "0xd01"))
            return CPU_TSV110;
        // Ampere
        else if (strstr(cpu_implementer, "0x50") && strstr(cpu_part, "0x000"))
            return CPU_EMAG8180;
    }

    p = (char *)NULL ;
    infile = fopen("/proc/cpuinfo", "r");
    while (fgets(buffer, sizeof(buffer), infile)) {
        if ((!strncmp("model name", buffer, 10)) || (!strncmp("Processor", buffer, 9)) ||
            (!strncmp("CPU architecture", buffer, 16))) {
            p = strchr(buffer, ':') + 2;
            break;
        }
    }

    fclose(infile);

    if (p != NULL) {
        if ((strstr(p, "AArch64")) || (strstr(p, "8"))) {
            return CPU_ARMV8;
        }
    }
#endif
    return CPU_UNKNOWN;
}

char *get_corename(void)
{
    return cpuname[detect()];
}

void get_architecture(void)
{
    printf("ARM64");
}

void get_subarchitecture(void)
{
    int d = detect();
    printf("%s", cpuname[d]);
}

void get_subdirname(void)
{
    printf("arm64");
}

void get_cpucount(void)
{
    int n = 0;
#if defined(linux) || defined(__linux__)
    FILE * infile;
    char buffer[2048], *p,*t;
    p = (char *)NULL;

    infile = fopen("/proc/cpuinfo", "r");

    while (fgets(buffer, sizeof(buffer), infile)) {
        if (!strncmp("processor", buffer, 9))
        n++;
    }

    fclose(infile);

    printf("#define NUM_CORES %d\n", n);
#endif
}

void get_cpuconfig(void)
{
    // All arches should define ARMv8
    printf("#define ARMV8\n");
    printf("#define HAVE_NEON\n"); // This shouldn't be necessary
    printf("#define HAVE_VFPV4\n"); // This shouldn't be necessary

    int d = detect();
    switch (d) {

    case CPU_CORTEXA53:
        printf("#define %s\n", cpuname[d]);
        // Fall-through
    case CPU_ARMV8:
        // Minimum parameters for ARMv8 (based on A53)
        break;

    case CPU_CORTEXA57:
    case CPU_CORTEXA72:
    case CPU_CORTEXA73:
        // Common minimum settings for these Arm cores
        // Can change a lot, but we need to be conservative
        // TODO: detect info from /sys if possible
        printf("#define %s\n", cpuname[d]);
        break;

    case CPU_NEOVERSEN1:
        printf("#define %s\n", cpuname[d]);
        break;

    case CPU_FALKOR:
        printf("#define FALKOR\n");
        break;

    case CPU_THUNDERX:
        printf("#define THUNDERX\n");
        break;

    case CPU_THUNDERX2T99:
        printf("#define THUNDERX2T99\n");
        break;

    case CPU_TSV110:
        printf("#define TSV110\n");
        break;

    case CPU_EMAG8180:
        // Minimum parameters for ARMv8 (based on A53)
        printf("#define EMAG8180\n");
        break;

    case CPU_THUNDERX3T110:
        printf("#define THUNDERX3T110\n");
        break;
    }
    get_cpucount();
}

void get_libname(void)
{
    int d = detect();
    printf("%s", cpuname_lower[d]);
}

void get_features(void)
{
#if defined(linux) || defined(__linux__)
    FILE * infile;
    char buffer[2048], *p,*t;
    p = (char *)NULL ;

    infile = fopen("/proc/cpuinfo", "r");

    while (fgets(buffer, sizeof(buffer), infile)) {
        if (!strncmp("Features", buffer, 8)) {
            p = strchr(buffer, ':') + 2;
            break;
        }
    }

    fclose(infile);

    if (p == NULL) return;

    t = strtok(p," ");
    while ((t = strtok(NULL, " "))) {
    }
#endif
    return;
}
